HPOFS.IFS

The High Performance Optical File System (HPOFS.IFS) is a removable media file system for optical storage devices. HPOFS can be used along with or instead of the OS/2 2.0, 2.1, 3.0 file allocation table (FAT) file system.

HPOFS uses the unique features of optical media, and features include:

• Long name file support (254 characters maximum length)
• Mixed case file name support
• Full extended attribute support
• Multiple code page support for world-wide use
  • Code page 437 U.S. ENGLISH
  • Code page 500 EBCDIC
  • Code page 850 INTERNATIONAL ASCII
  • Code page 942 JAPANESE
  • Code page 944 KOREAN
  • Code page 948 CHINESE

Use HPOFS in the following circumstances:

• Copying files from hard disk drives formatted by using the High Performance File System (HPFS).

When copying files from HPFS-formatted hard disk drives onto HPOFS formatted optical cartridges, mixed case and long-file names, in addition to extended attribute files, are preserved.

• Migrating 5.25-inch cartridges into the 3995 optical library.

Because HPOFS is used in the 3995 libraries, cartridges can be loaded directly into the library without having to be copied.

• Ability to read cartridges formatted and written on a 3995 optical library.

• High performance requirements.

HPOFS provides superior performance in many situations, especially when many files are present on a cartridge.

Use the standard FAT file system when exchanging optical media with another station that does not have HPOFS. Do not use HPOFS in this circumstance.

NOTE: Refer to IBM 3995 Optical Library Dataserver: Optical Disk Format for more specific information.

DEVICE=C:\FILESYS\MO.SYS <parameters>
IFS=C:\FILESYS\HPOFS20.IFS

Default settings:

DEVICE=C:\FILESYS\MO.SYS
IFS=C:\FILESYS\HPOFS20.IFS 

Parameters (MO.SYS):

/1

Use 1024 byte per sector media.

Platform Support:

OS/2 1.x	OS/2 2.x	OS/2 3.0	OS/2 4.0	OS/2 4.5x
No	Yes	Yes	Yes	Yes